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The lunar phases are produced by the interaction between the movements of the sun, moon and earth. In one year the moon takes thirteen tours around the earth, ie thirteen lunations. Each lunar cycle lasts about 28 days.Normally, we know eight types of moon phase, New Moon, Waxing Crescent, First Quarter, Waxing Gibbous, Full Moon, Waning Gibbous, Last Quarter and Wanning Crescent. But as the moon takes about 28 days to repeat its phases, it involves not only the four above, but by infinite intermediate stages to which tradition has not named them. This is why astronomers, the moon phases relate percentage of illumination. Thus, the new moon is 0%, the full is 100%, and both are growing and shrinking 50%.